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Definition of Black swan
1. Noun. Large Australian swan having black plumage and a red bill.
Definition of Black swan
1. Noun. An Australian swan whose feathers are black. ¹
2. Noun. An occurrence believed impossible or not to exist. ¹
3. Noun. An occurrence believed impossible or not to exist, subsequently shown to exist. ¹
¹ Source: wiktionary.com